Wordle is a program "for generating 'word clouds' from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text."
As the ESV Blog points out, Andrew (at The Crazy Australian blog), took the ESV New Testament and created a Wordle of the most prominent words:
And David Reimer sends along his Worldle of the (ESV) Psalms:
If you want to see what the entire ESV text of the Bible looks like, click here.